i have created different administrative rights ID for different admins.

how come i know which Administrator ID change/add which users to access the sharing folder

for example: A folder is shared to selected persons like john, anna, zuzu

Administrator add a user in it "ralf"

how come i know which Administrator Add the new user Ralf

Using Windows Server 2008r2 as a file sharing server

further, i've checked local security policy and enable audit privilege use. Now i can find the log but limited information. i would like to know the user detail also. like xyz Admin adds ralf user to access... hope you understand my point and if it is possible i love to know